E-mailing him might mess with his mind but I would think what your ultimate goal would be. These OM/OW don't really seem to care that they are messing with other people and their lives, they are usually just as selfish as the WAS is.
I did contact the OW aka skank via myspace. I did ask her to stay out of our lives and that I didn't believe we could work on our marriage while she was in the picture. She sent it right away to my then H. I got some anger out but in the long run, it didn't make a difference.
Again, just look at your goal.
kat
Me-53(and learning!) S24, S21, D18, D17 Just keep swimming, Just keep swimming. Dory